# Practice Test: Question Set - 14

**1. For computing the run off volumes of large areas, numbers of infiltrations used are**

- (A) 2

- (B) 3

- (C) 4

- (D) 5

**2. The efficiency of a pump may be taken as**

- (A) 0.55

- (B) 0.60

- (C) 0.65

- (D) 0.70

**3. The infiltration capacity during rain storm, is considerably reduced due to**

- (A) Surface
detention

- (B) Soil
moisture

- (C) Compaction
due to rain

- (D) All
the above

**4. The average mean velocity of a stream having depth**

*h*, may be obtained by taking the average of the readings of a current meter at a depth of- (A) 0.1

*h*and 0.9

*h*

- (B) 0.2

*h*and 0.8

*h*

- (C) 0.3

*h*and 0.7

*h*

- (D) 0.4

*h*and 0.6

*h*

**5. A well is sunk in an unconfined aquifer having a saturated depth of 100 m. Assuming the equilibrium flow conditions and a homogeneous aquifer and radius of influence to be same, the ratio of discharges at 20 m and 40 m draw downs, is**

- (A) 2/3

- (B) 5/4

- (C) 4/5

- (D) 8/7

**6. A soil strata may consist of**

- (A) Soil
zone

- (B) Intermediate
zone

- (C) Capillary
zone

- (D) All
the above

**7. A river is said to be of uniform section if in its section**

- (A) A
segment of a circle can be fitted

- (B) A
parabolic section can be fitted

- (C) A
rectangular section can be fitted

- (D) All
the above

**8. Isopiestic lines are the contours**

- (A) Drawn
to represent water table

- (B) Drawn
to represent piezometric heads

- (C) Drawn
to piezometric surface

- (D) None
of these

**9. Pick up the correct statement from the following:**

- (A) When
rainfall rate exceeds the infiltration capacity, the water enters the soil at
full capacity rate

- (B) When
rainfall rate is less than the infiltration capacity, the infiltration rate is
approximately equal to the rainfall rate

- (C) The
actual infiltration rate at any time may be equal to or less than the
infiltration capacity

- (D) All
the above

**10. While calculating the average depth of annual precipitation in a catchment basin, importance to individual rain-gauge station is given in**

- (A) Arithmetical
method

- (B) Thiessen's
mean method

- (C) Isohyetal
method

- (D) Both (b) and
(c)

**11. If the viscosity of ground water is 1.00, the Slitcher's constant is 400, the effective size of soil particles in aquifer is 0.5 mm and hydraulic gradient is 1 in 80, the velocity of flow is**

- (A) 0.25 m/day

- (B) 0.50 m/day

- (C) 1.00 m/day

- (D) 1.25 m/day

**12. Pick up the correct statement from the following:**

- (A) Index
of wetness = actual rainfall in a year at a place/normal rainfall of that place

- (B) Normal
annual rainfall is obtained by taking the mean of the annual rainfall over a
period of 35 years

- (C) Index
of wetness gives an idea of the wetness of the year

- (D) All
the above

**13. If total run off of a basin of 50 hectares is 0.8 cm, the ordinate of Bernard's distribution graph, may be calculated by the formula (where**

*Q*is the discharge in cumecs at the given time)- (A)

*y*= 50

*Q*

- (B)

*y*= 100

*Q*

- (C)

*y*= 200

*Q*

- (D)

*y*= 250

*Q*

**14. Water is useful for**

- (A) Running
hydroelectric turbines

- (B) Floating the
boats and ships

- (C) Providing
steam for running locomotives

- (D) All
the above

**15. The recurrence interval (R.I.) of 20 cm rain storm at a place is 5 years.**

- (A) The
place will definitely have 20 cm rain storm after every five years

- (B) The
place may have 20 cm rain storm after every five years

- (C) The
place may have 20 cm rain storm within a set of 5 years twice

- (D) None
of these

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